Now,focus on link farm... Link spamming:Inflating the rank of a page by creating boosting links to it From unaffiliated sites (e.g.blogs,guest books,web forums,etc.) From partner sites:Link exchanges From own sites:Link farms Google PageRank p.=-ra+g,k=far+只n
Now, focus on link farm… ◼ Link spamming: Inflating the rank of a page by creating boosting links to it ◼ From unaffiliated sites (e.g. blogs, guest books, web forums, etc.) ◼ From partner sites: Link exchanges ◼ From own sites: Link farms ( ) N i T i N i T i p N p L N p L p + = (1− ) + 1 = (1− ) + (1 ) 1 Google PageRank
Link Exchanges ■reciprocal link交换链接：两个objects:之间建立互相指向的 links,ensure mutual traffic. Three way linking ·生成在Search Engine看来更加"natural'"links. siteA->siteB->siteC->siteA ■Automated Linking automatic link exchange services Quick and lazy schemes are increasingly worth less and less,so avoid them...at all costs. Here's a good rule of thumb for SEO,if it's automated,super-easy,or super-fast,avoid it. Why Link Exchanges are a Bad Idea by Scott Allen
Link Exchanges ◼ reciprocal link交换链接：两个objects之间建立互相指向的 links，来ensure mutual traffic. ◼ Three way linking ◼ 生成在Search Engine看来更加"natural" links. ◼ siteA -> siteB -> siteC -> siteA ◼ Automated Linking ◼ automatic link exchange services Quick and lazy schemes are increasingly worth less and less, so avoid them…at all costs. Here’s a good rule of thumb for SEO, if it’s automated, super-easy, or super-fast, avoid it. Why Link Exchanges are a Bad Idea by Scott Allen
Aggregate Page Rank Total page rank is affected by incoming links Number of pages ·Incoming Links Outgoing Links ·Dangling Nodes Topologies that: WEB-SITE Use as many pages as possible minimize outgoing links minimize dangling nodes outgoing links
Aggregate Page Rank ◼ Total page rank is affected by ◼ Number of pages ◼ Incoming Links ◼ Outgoing Links ◼ Dangling Nodes ◼ Topologies that: ◼ Use as many pages as possible ◼ minimize outgoing links ◼ minimize dangling nodes WEB-SITE incoming links outgoing links
Chain topology (more is better) ① a PR(Web Site)=0.34 0.18 0.34 0.47 ① a PR (Web Site) 0.11 0.21 0.29 0.37 =0.21+0.29=0.50 ①→@→6+©→@+@→①→o 0.03 0.070.090.120.140.160.17 0.18 PR(Web Site)=0.77
Chain topology (more is better) I a O 0.18 0.34 0.47 I a O 0.11 0.21 0.37 b 0.29 PR (Web Site) = 0.34 PR (Web Site) = 0.21+0.29 = 0.50 I a 0.03 0.07 b 0.09 c 0.12 d 0.14 e 0.16 f 0.17 O 0.18 PR (Web Site) = 0.77
Ring topology ① a 0.18 0.34 0.47 0.18 ① a以 0.03 0.11 f b 0.15 0.11 PR(Web Site)=0.86 e 0.14 0.12 d】 0.13
Ring topology I a O 0.18 0.34 0.47 I a O b c d e f 0.03 0.18 0.11 0.11 0.12 0.13 0.14 0.15 PR (Web Site) = 0.86